Well ,most if not all of us have , at some stage in our lives witnessed rainbows.But have you ever seen a Circular Rainbow??...A circular bow?...I must be joking right?? WRONG!!

Circular rainbows do exist....In fact all rainbows are circular.But due to your shadow blocking some of the light , or due to the light disappearing beyond the horizon ,rainbows appear to be ,well , BOWS!!

Descartes through his studies had pointed out that rainbows must be symmetrical.He simplified the study of the rainbow by reducing it to a study of one water droplet and how it interacts with light falling upon it.

In ancient times Rainbows were said to be Godly phenomenon!!

So how can you see a circular rainbow?Well,from the surface of the earth its simply not possible!However when viewed from a high altitude, such as an airplane,circular rainbows can be seen when the angle between the sun, the water droplets, and the plane is around 42 degrees. Here , the rainbow is horizontal, meaning that it is parallel to the ground and hence not blocked by the horizon.

Rainbows are a sure predictor of the direction of rain clouds.There are many proverbs related to rainbows...Among them my favourite...